“Development of a technology to investigate inside the Reactor Primary Containment Vessel (PCV)”
‐Site test “Investigation B1”
on grating around the pedestal inside Unit 1 PCV‐
April 6, 2015
Tokyo Electric Power Company
The content of this material includes the output of the International Research Institute for Nuclear Decommissioning (IRID).
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1
1. Investigation overview
監視カメラ Change shape
Camera
2 crawlers
Forward
Size: 600(L)×70(W)×95(H)mm Size: 220(L)×290(W)×95(H)mm
Cable
Seal box for PCV investigation
Guide pipe (Inside diameter: 100mm)
Inside PCV
Moving through pipe
Robot Inside PCV
Moving on grating
The robot with crawlers has a function to change its shape from when it moves inside the narrow pipe (X‐100B penetration pipe: inside diameter: 100mm) to when it reaches inside the PCV and moves around the grating.
X‐100B penetration pipe
Thermometer
CCD camera with tilt‐
function Equipped with
dosimeter Line laser for
measuring distance
Monitoring camera
At Fukushima Daiichi NPS Unit 1, investigation is planned using a robot for the purpose of earning information on the 1
stfloor grating inside the Primary
Containment Vessel (PCV). The robot will be inserted from X‐100B penetration pipe.
2 Investigation plan
No. Purpose Location Conte
nt Device
①
Investigating obstacles for further investigation under the grating outside the pedestal (“Investigation B2”)
Opening to access under the grating
Video CCD camera
②
Investigating obstacles for further investigation inside the pedestal
CRD rail Video CCD camera
③
Investigating environment
On the access route *
Tempe rature Radiat ion
Thermometer Dosimeter
Investigating existing
structures Video CCD camera
*Investigation will be conducted within the possible area.
Access route
2. Investigation method
X‐100B penetration
pipe Opening to under
grating
CRD rail
The investigation will be conducted twice (Clockwise route, counterclockwise route)
Clockwise route
Counter‐
clockwise
route
3
3. Investigation location
The robot stops and collects data (images, temperature, dosage etc. )at each investigation location
: Access route (counterclockwise)
X-100B The locations may change due to
environment inside the vessel.
Investigation location
①Opening to under the grating
②CRD rail
PLR pump
HVH MS pipe
PL pipe
HVH
Pedestal opening
B1, B2,
B3, B4, B5, B6,
B7, B8,
B9, B10, B11, B12, B13, B14, B18,
B0,
B17, B16,
B15,
C2, C3, C4, C5, C6, C7, C8, C9, C10,
C11,
C1, C0,
C0, C11, B0, ～ B18,
～
: Access route (clockwise)
0
The robot moves slowly confirming its surrounding environment,
moving its camera up‐down and right‐left on each investigation location.
②Dosimeter
③Thermometer
④Board camera
①Camera [Investigation image]
4
4. Purpose of “Investigation B1”
Purpose of “Investigation B1” will be collecting information on 1
stfloor grating.
Investigation results ⇒ It will be used to make a plan of “Investigation B2” *.
：Access route for “Investigation B2”
: Access route inside pedestal
Access route for workers 1
stfloor grating
X‐6 penetration
pipe
Opening to under grating
pedestal
X‐100B penetration
pipe
：A
rea of “Investigation B2”
*”Investigation B2” ⇒ Investigation under grating outside the pedestal
5
Moving the permanent monitoring gauge
The permanent monitoring gauges will be removed due to the conduct of
“Investigation B1” at Unit 1, and will be installed back at the same place
5. Others [Moving the Unit 1 PCV permanent monitoring gauge]
T7 OP.14500 T6
*OP.14000 T5 OP.13230 T4 OP.12500 T3
*OP.11200 T2 OP.7500 T1 OP.6330 Thermometer:
thermocouple
*Thermometer for monitoring cold shutdown condition as written in the “Implementation plan Chapter 3 provision 18
:Thermomete r
：Water level gauge
HVH -12D
D/W 1stfloor grating OP.9708 X‐100B
OP.14700
Gauges which will be removed
D/W bottom OP.6180
L7 OP.9380 L6 OP.8580 L5 OP.7780 L4 OP.7280 L3 OP.6780 L2 OP.6480 L1 OP.6330
Water level gauge: electrode
They will be taken off from the list of
monitoring cold shutdown during the investigation.
6
April 2015
６ ７ ８ ９ １０ １１ １２ １３ １４ １５ １６ １７ １８
Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat
1. Preparing for investigation (from March 31)
2. Removing permanent monitoring gauges
3. Investigation B1
4. Installing monitoring gauges on the same place
6. Schedule
Installing equipment
Removing gauges
Installing gauges Removing/installing
equipment
Removing equipment
